US Bridges

DUSTY/6171 over Alkali Flat Creek

Fair

Whitman County, Washington · 0.33 MI E SR 26 · Structure no. 086646000000000

Built
1940
85 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
174
2022 count
Owner
County
County Highway Agency

About this bridge

DUSTY/6171 over Alkali Flat Creek is a concrete culvert carrying DUSTY/6171 over Alkali Flat Creek in Whitman County, Washington. It was built in 1940, so it is 85 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 174 vehicles a day, roughly 43% of them trucks, projected to reach 192 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesDUSTY/6171
CrossesAlkali Flat Creek
Location0.33 MI E SR 26
RouteCounty Highway 61710
Coordinates46.81098, -117.6483
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating17 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length28 ft (8.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic174 (2022)
Projected traffic192 by 2044
Trucks43%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was DUSTY/6171 over Alkali Flat Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is DUSTY/6171 over Alkali Flat Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does DUSTY/6171 over Alkali Flat Creek carry?

About 174 vehicles per day (2022 count), of which roughly 43% are trucks.

How long is DUSTY/6171 over Alkali Flat Creek?

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m).

Who owns DUSTY/6171 over Alkali Flat Creek?

It is owned by the County Highway Agency.